Doll Modification
From American Girl Dolls Wiki
Doll Modification is any sort of permanent change to a doll to give them different features, most often used to make Custom Dolls. Given that American Girl only offers specific options in hair color, eye color, and skin tone, variations are the easiest way to get more unique dolls into a collection.
The most common types of modification are Ear Piercing, Eye Swapping, Hair Cutting, Freckling and Rewigging.
